Copy Constructor w/gcc411

Copy Constructor w/gcc411

[Phy Prabab]

Hello,

I am curious, I have the test case listed which compiles fine with
gcc323 and Sun compiler 10 and 11.  The way around the gcc error is to
move the coy constructor out of private.  What am I doing wrong WRT
gcc411?  I have remarked the workaround.

[~/test]$ g++ test.c -o test
test.c: In function 'int main()':
test.c:12: error: 'A::A(const A&)' is private
test.c:21: error: within this context
[~/test]$ g++ --version
g++ (GCC) 4.1.1
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[~/test]$


TIA,
Phy

[~/test}$ cat test.c
#include <iostream>
using namespace std;

class A{
public:
  A(int i){
    a = i;
  }

  //A(const A&);
private:
  A(const A&);
  int a;
};

void f(const A&){
  printf("Hello!\n");
}

int main(){
  f(A(1));
  return 0;
}

Re: Copy Constructor w/gcc411

[John Love-Jensen]

Hi Phy,

> What am I doing wrong WRT gcc411?

You are doing nothing wrong WRT gcc411.

What you are doing is wrong WRT C++.

C++ requires accessibility of the copy constructor for the temporary, even
though the copy constructor was eliminated.

You can work around that issue by making a named variable and passing in the
named variable to the function.

HTH,
--Eljay